In acoustic detection, the profile characteristic of a particular object or class of objects, such as a school of fish or a specific ocean-bottom formation.
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PERIDYNAMIC LOUDSPEAKER
[ENG ACOUS] Boxtype loudspeaker baffle designed to give good bass response by minimizing acoustic standing.
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NOMINAL PASS-BAND CENTER FREQUENCY
The geometric mean of the nominal upper and lower cutoff frequencies of an acoustic or electric filter.
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NOMINAL BANDWIDTH
The difference between the nominal upper and lower cutoff frequencies of an acoustic or electric filter.
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MOD ROOM
[ENG ACOUS] A control room in a sound-recording studio in which the acoustic treatment comprises a uniform disposition of the sound-absorbent material all about the room.
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MAGNETIC LOUDSPEAKER
[ENG ACOUS] Loudspeaker in which acoustic waves are produced by mechanical forces resulting from magnetic reactions. Also known as magnetic speaker.
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LINE HYDROPHONE
[ENG ACOUS] A directional hydrophone consisting of one straight-line element, an array of suitably phased elements mounted in line, or the acoustic equivalent of such an array.
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INDUCTION SILENCER
A device for reducing engine induction noise, which consists essentially of a low-pass acoustic filter with the inertance of the air-entrance tube and the acoustic compliance of the annular and central volumes providing acoustic filtering elements.
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HYDRODYNAMIC OSCILLATOR
[ENG ACOUS] A transducer for generating sound waves in fluids, in which a continuous flow through an orifice is modulated by a reciprocating valve system controlled by acoustic feedback.
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HOWL
[ENG ACOUS] Undesirable prolonged sound produced by a radio receiver or audiofrequency amplifier system because of either electric or acoustic feedback.
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ACOUSTIC
A term pertaining to sound, or the science of sound.
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